142785-61-3 20(S)-(3-Hydroxy-3-methylbutyloxy)pregna-5,7-diene-1alpha,3beta-diol 20-(3-Hydroxy-3-methylbutyloxy)-(2beta-(3)H)pregna-5,7-diene-1,3-diol 20-(3-Hydroxy-3-methylbutyloxy)pregna-5,7-diene-1,3-diol HMBOP